Clamp



Aug. 10,1926. r1,595,914

E. NESTLER CLAMP vFiled Deo. 4, 1924 INVENTOR,

Patented Aug. 10, 1926.

UNH-ED STATE@ FFQE.

EMIL NESTLER, OF NEVI YGRK, N. Y.,`ASSGNOR 'I O NESTLER RUBBER FUSING CO. INC., 0F NEW YORK, N. Y., .A CORPORA'EGN OF' NEVI YORK.

CLAMP.

Application inea Decanter e, 1921i.

This invention relates to clamps and more particularly to clamps designed for exerting pressure on tires or shoes or other articles within a mold during retreading or other fusing or vulcanizing` operation.

rlhe invention has particular reference to apparatus for use in connection with the retreading of shoes or tires in which molds such as set forth in my copendingapplication Serial No. 753,977 are used. Vihese molds are heated in a steamless curing cabinet such as embodied in another copending application Serial No. 753,978, to fuse or vulcanize the rubber ot the shoe or tire while it is held under pressure by my improved clamp which latter yforms the subject matter of this application.

A further object is to provide a clamp in which a yoke` is employed and a single medium for exerting pressure on the yoke whereby a plurality of plungers or pressure feet are held under the desired pressure against a sand bag or like element within the shoe or tire so as to press the outer tace of the shoe or tire against the inner face of the mold. The invention, therefore, resides particularly in the construction and arrangement of elements constituting a clamp or pressure device, the broad idea of which being to exert the maximum of pressure at a plurality ot points by a single pressure means, or, in other words, to distribute the pressure Awhere it will do the most good.

lith these and other objects in View, the invention consists in certain novel features ot construction and combinations and arrangements of parts which will be more fully hereinafter described and pointed out in the claims.

In the'accompanying drawings- Figure 1 is `a perspective view showing my improved saddle and yoke in their normal assemblage and as desired for use in connection with a segmental mold;

Figure 2 is a view in transverse section through a segmental mold showing my im proved clamping means in operative position thereon;

Figure 3 is a view in section on the line 3-3 of Figure 2;

Figure 1 illustrates a pair of pressure feet or plungers;

Figure 5 1s a view similar to Figure 2Y illustrating my invention in slightly modiiied form and as applied to a complete circular mold;

Figure 5 illustrates in detail the strap and saddle in the assemblage shown in Figure 5;

Figure 7 is a perspective view of my im proved yoke.

VReferring more particularly to Figures 1 to et, inclusive, 1 represents a segmental mold having flanges or webs 2 at its sides, and vsaid tlanges or webs are provided with notches 8 for a purpose which will hereinalter appear. `Within the mold 1 a tire or shoe et is located, and a bag or bags 5 preferably containing sand or other similar material (S is or are. located inside of the shoe.

7 represents the saddle of my improved clamp which is formed with openings 8 adjacent its ends yfor the reception of bolts These bolts 9 are located in the notches with the heads 10 of the bolts below the webs 2. rEhe upper ends of the bolts are projected through the openings 8 and receive washers 11 and nuts 12, both located thereon above the saddle 7.

The saddle 7 is provided with an upwardly proj ecting` central post 13. This post may constitute an ordinary bolt having its head 141 located in a socket 15 in the lower face of the saddle. rlhe upper end of this post 13 is screw-threaded and is projected through the center ot a yoke 16 located at right angles to the saddle 7. A washer 17 is located on top of the yoke 16 and a clamping nut 18 is'screwed onto the post and against the washer.

rlhe saddle 7 is provided at its ends with depending enlargements 19, preferably having sockets 2O in their lower faces. 21, 21 represent pressure feet or plungers which have extended base portions and are shaped at their lower faces so as to fit snugly against the sand bag 5 and exert pressure thereon. The upwardly projecting reduced portions 22 of the pressure feet 21 rest in the notches 2O in yoke 16 so that when the nut 18 is tightened it will force the yoke downwardly and exert pressure on the feet 21; hence pressure will be applied at two dill'erent points by a single pressure member.

lhile 1 have illustrated a yoke which exerts equal pressure on two pressure feet, it is obvious that the invention is not limited to any particular number of pressure feet as l Wish to cover the idea broadly oi a single pressure member or clamp which functions to exert pressure at a plurality of different points or stations so as to give the pressure Where needed and produce the best results.

ln Figures 5, 6 and 7, I illustrate a construction Which is especially adapted 'for use in connection with a complete circular mold such as indicated by the reference numeral 23. lt is, ot course, to be understood thatthis mold 23 is made in sections to falilitate the insertion or removal of the shoe or tire, and to this mold I secure a pair ot straps 2l located outside of the mold and secured thereto by a bolt 25 and nut 26. rlhe free ends of these straps 2a are termed with slots 27 receiving the hooked ends 2S ot a saddle 29. This saddle 29 has a screwthreaded post 30 at its center projecting through a yoke 3l similar to the yoke 16 above referred to, and this yoke 16 engages pressure feet 32 similar to the pressure feet 2l above described.

lt will thus be noted that by reason of this construction the shoe or tire can be easily and quickly clamped in the mold and the desired pressure exerted at a number of different points so as to insure a complete and uniform pressure throughout the shoe or, at least, througliout that port-ion thereof which contacts With the mold. Furthermore, the clamping assemblage can be readily removed so as to facilitate the operation.

Various slight changes and alterations might be made in the general form of the parts described Without departing from my invention, and hence l do not limit myself to the precise details set forth but consider myself at liberty to make such slight changes and alterations as `fairly fall Within the spirit and scope of the appended claims.

I claim 1. A clamp of the character described, comprising a saddle, means for connecting the saddle to the mold, a yoke connected to the saddle, and a plurality of pressure feet engaged by the yoke.

2. A device of the character' described, comprising a saddle, means for connecting the same to a mold, a post carried by the saddle, a yoke receiving the post, clamping means on the post exerting pressure on the yoke, and a pair ot pressure feet engaged by the respectivev ends of the yoke.

3. A clamp off the character described, comprising a saddle adapted to be positioned transversely across a mold, means connecting the ends of the saddle with the mold, a central screw-threaded post on the saddle, a yoke extending longitudinally of the mold receiving the post, a clamping nut on the post engaging the yoke, and a pair of pressure feet engaged by the respective ends of the yoke. y

Ll. .'ln combination with a mold adapted to receive a tire or shoe therein, a sand bag in the shoe or tire, a saddle extending transversely across and spaced from the mold, means connecting the saddle to the mold, a screw-threaded post projecting centrally from the saddle, a yoke extending longitudinallyl or' the mold and at right angles to the saddle and receiving the post, a clamping` nut on the post adapted to move the yoke toward the saddle, said yoke having notched enlargements at its respective ends, pressure feet engaging a sand bag, and eX- tensions on the pressure feet located in the sockets of the yoke.

EMIL NESTLER 

